88be541778
Add the JSON reader (parser) to library/modules/std/json.sx, the inverse of the F2.1 writer over the same value model: insertion-ordered objects, arrays, strings (full unescaping incl. \uXXXX + surrogate pairs), s64 integers, bool, null. Heap discipline (binding): exactly two allocation kinds, both through the EXPLICIT `alloc` parameter, never the implicit context allocator — composite backing stores (Array/Object.items via add/put) and decoded escaped-string buffers (bounded by the raw span). Un-escaped string values are zero-copy VIEWS into the input buffer (valid only while it lives); scalars carry no heap. Failure surfacing (hard contract): malformed input raises a meaningful JsonParseError variant (UnexpectedToken / UnexpectedEnd / BadEscape / BadNumber / TrailingGarbage) on the error channel, never a bogus value. Trailing non-whitespace is TrailingGarbage; fractions/exponents, out-of-s64 magnitudes, and leading zeros are BadNumber. Number accumulation runs in negative space so s64 MIN parses exactly. examples/0714-modules-json-reader.sx asserts the parsed structure (insertion order, every kind), proves the view-vs-decoded heap split by pointer containment, round-trips back through the writer byte-for-byte, decodes a surrogate-pair into 4 UTF-8 bytes, and checks every malformed variant. Filed issues/0078: a string `==` (or any sub-CFG operand) used in a short-circuit `and`/`or` emits invalid LLVM IR (stale PHI predecessor), hit while writing the example's assertions and worked around there by not combining comparisons with `and`/`or`. src/ untouched.
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